Bullet Lifesteal

This article is about the stat. For the item, see Bullet Lifesteal (item).

Bullet Lifesteal is a stat that causes a percentage of bullet damage dealt to be regained as health.

Math

Despite being presented in-game as +X% Bullet Lifesteal, multiple sources of bullet lifesteal stack multiplicatively, not additively.

The formula for bullet lifesteal is: $B{L}_f=1-\prod _{i=1}^n(1-B{L}_i)$
where:
$\begin{array}{rl}n& =\text{number of bullet lifesteal sources,}\\ B{L}_i& =\text{initial bullet lifesteal,}\\ B{L}_f& =\text{final bullet lifesteal}\end{array}$

For example, with 10% Bullet Lifesteal from Crippling Headshot and 35% Bullet Lifesteal from Leech, total bullet lifesteal is:

$B{L}_f=1-(1-0.10)\times (1-0.35)=41.5\mathrm{\%}\approx 41\mathrm{\%}$

Sources

List of items

Name	Cost	Category	Stat change
Active Reload	1,600	Weapon	+18% Bullet Lifesteal
Bullet Lifesteal	1,600	Vitality	+16% Bullet Lifesteal
Fury Trance	3,200	Vitality	+22% Bullet Lifesteal
Leech	6,400	Vitality	+30% Bullet Lifesteal
Vampiric Burst	6,400	Vitality	+16% Bullet Lifesteal
Vampiric Burst	6,400	Vitality	+80% Bullet Lifesteal